Typewriting-machine



G. 8. LEE.

TYPEWRITING MACHlNE.

APPLICATION FILED FEB. 21, 1918.

1,357,573, Patented Nov. 2, 1920.

UNITED STA'llES PATENT OFFICE.

GEORGE S. LEE, OF SEATTLE, WASHINGTON, ASSIGNOR TO UNDERWOOD TYPEWRITER. COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWBITING-MACHINE.

Specification of Letters Patent.

Patented Nov. 2, 1920.

Application filed February 21, 1918. Serial No. 218,385.

I have provided type-bars with type-.

blocks or heads which may be conveniently removed from the type-bars and replaced by other type-blocks having the same characters thereon. Each type-bar,.at its free end, is provided with a socket or receptacle, into which the type-block may be set and rigidly secured without the assistance of a special tool. The securing is preferably done by a sliding bolt, which may be springactuated, and carried at the under side of the type-bar; and may engage with ashank provided on the type-block.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a sectional side view of an Underwood typewriting machine, showing my invention applied thereto.

Fig. 2 is an enlarged detail side view of a type-bar, partly in section, showing the type-block w1thin the receptacle of the typebar, and the bolt for securing the type-block.

F ig. 3 is a sectional front view of the part shown in Fig. 2, and taken on the line 3-3 of Fig. 2.

Fig. 4 is a perspective view of the typeblock.

Fig. 5 is a perspective view of a typebar, showing the receptacle into which the type-block may be placed, and the bolt for securing the latter.

Fig. 6 is a View similar to Fig. 2, but showing a greater angle to the taper of the receptacle and the shank of the type-block seated therein.

Fig. 7 is a view similar to Fig. 3 and taken on the line 77 of Fig. 6.

Each type-block 10 may be provided with upper and lower-case types 11 and 12, and may be provided with a shank 13 which may be fitted into a socket or receptacle 14, Fig. 5, on the end of each type-bar 15. A hole 16 in the receptacle 14 is preferably rectangular and tapered, so that its outer end is an abutment formed by a solid part of the type-bar, adapted to hold the type-block against the centrifugal force as it swings to print, and the shank 13 is shaped to conform with that of the hole 16, so that the 1type-block is accurately positioned on the To hold the type-block 10 on the type-bar 15, I have provided a slidable bolt 17 carrled by cars 18 and 19, formed on the under side of the type-bar between the type and the bearing of the typebar. Said bolt is preferably provided at one end with a cam 20 which engages with a projection 21 on the under side of the shank of the typeblock. A spring 22 may be provided to press the bolt 17 firmly against the projection 21 on the shank of the type-block, thereby securing it within the receptacle 14 of the type-bar 15. The centrifugal force of the bolt, as it swings with the type-bar toward the platen, only serves to hold the type-head more firmly in place, because it urges the bolt outward. The spring 22 may be coiled around said bolt 17 and act between the ear 19 on the type-bar and a collar -23 secured to the bolt 17. p

To release the bolt 17, when attaching or detaching a type-block, it may be provided with a finger-piece 24.

To remove the type-block 10 from its receptacle'14, the bolt 17 is moved by means of the finger-piece 24 against the tension of the spring 22 to move the cam 20 clear of the projection 21 on the shank of the typeblock, which may then move past the cam 20 while removing the type-block from the receptacle. To attach a type-block to the bar, the bolt 17 is again moved by means of the finger-piece 24 to withdraw the cam 20 from the path of the projection 21 on the shank of the type-block 10, thus permitting the type-block to be set into the receptacle 14, after which the cam 20 of the bolt 17 is permitted, by means of the spring 22, to move into engagement with the projection 21 on the shank of the type-block, thus securing it in place thereon.

To prevent the bolt, 17 from turning in its bearings comprising the ears 18 and 19, so that the cam 20 will always properly engage the projection 21, the collar 23, secured to the bolt, may be flattened, and bear against the under side of the type-bar.

To avoid sticking of the type-block with in the receptacle, which may be caused by having a taper of small angle on the shank 13, said receptaclerand shank of the typeblock 10 may be changed to the forms shown in Figs. 6 and 7 in which it will be seen that the angle of the taper is considerably greater than that shown in Fig. 2.

.I have preferably shown my invention applied to an Underwood machine, in which key-levers 25, when actuated, move bellcranks 26 about their fulcrums 27 to swing the; type-bars 15 to cause the types 11 and 12 to print against a rotatable platen 28, around which a worksheet (not shown), is usually guided. The platen may be rotatably supported on a carriage 29 for linespacing operations, and may be moved from one letter-space position to another by a spring drum 30. These letter-space movements of the carriage may be controlled by the type-bars 15, each one being provided with a heel 31, which, as the type-bar approaches the printing point, engages with a curved universal bar 32 to move the latter rearwardly against the tension of a suitable return spring (not shown), thus causing a dog-rocker 33 with a fixed dog 34 and a loose dog 35 thereon to vibrate between the teeth 36 of an escapement wheel 37, geared to the typewriter carriage 29, by means of a pinion 384meshingwith a feed-rack 39;

the latter being pivotally supported on the typewriter carriage.

The invention may be used with other forms of type-carriers.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim 1. In a typewriting machine, the combination of a type-carrier comprising an abutment, a type-block which may be set against the abutment to receive the centrifugal force as the carrier swings to print, a lug on the block at its back, a bolt slidable outwardly on said type-carrier tov engage the lug on the block to secure said typeblock thereon against the abutment, and a sprin holding said bolt efl'ective.

2. In a typewriting machine, the combination of a type-carrier comprlslng a recepcarried by said type-bar for securing sald type-block, having an end to bear against the type-blo ck, a cam on said end, and a sprlng tending to press said bolt against the block along the line of' centrifugal force as the type-bar swings to print.

4. In a 'typewriting machine, the combination of a type-bar having an opening near its free end and at right angles to the direction in which said type-bar extends,

said opening being tapered, a type-block comprlsing a tapered shank fitting into said opening, and means comprising a-cam 'engaging with said shank for securing said type-block.

5. In a typewriting' machine, the combination of a type-carrier comprising a receptacle, a type-block which may be set'into said receptacle, and a spring-controlled plunger carried by said' type-carrier to secure said type-block on said type-carrier.

6. In a typewriting machine, the combination of a type-bar comprising an abutment'including an inclined face, a typeblock adapted to fit said face, a slidable bolt, and a cam on one of said last twomentioned elements, said bolt adapted to secure. said type-block to said type-bar through the intermediary of said cam.

7 In a typewriting machine, the combi' nation with a type-bar having an opening with inclined sides, a type-block adapted to fit said opening and having a lug-projecting through the back, and a bolt slidable on the bar and adapted to engage said lug to hold the block.

. GEORGE S.- LEE.

Witnesses: i

F. T. WHEELER, M.D. BownEN. 

